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A305043
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Number of nX4 0..1 arrays with every element unequal to 0, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.
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2
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1, 13, 9, 11, 20, 17, 25, 70, 67, 101, 292, 325, 485, 1318, 1679, 2521, 6284, 8945, 13753, 31542, 48955, 77781, 166412, 275213, 452509, 918598, 1587071, 2691137, 5266372, 9359801, 16275257, 31095926, 56231123, 99669125, 187634916, 342748925
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 3*a(n-1) -2*a(n-2) +4*a(n-3) -12*a(n-4) +6*a(n-5) +2*a(n-6) +3*a(n-7) -3*a(n-9) for n>13
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EXAMPLE
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Some solutions for n=5
..0..0..1..0. .0..1..0..0. .0..1..1..1. .0..0..0..0. .0..1..0..0
..1..1..0..1. .1..0..1..1. .0..1..1..1. .1..1..1..1. .1..1..0..0
..1..1..1..1. .1..1..1..1. .0..1..1..1. .1..1..1..1. .0..0..0..0
..1..1..0..1. .1..0..1..1. .0..1..1..1. .1..1..1..1. .0..0..1..1
..0..0..1..0. .0..1..0..0. .0..1..1..1. .0..0..0..0. .0..0..1..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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